Run with no arguments to see help menu, should appear similar to this:

MySQL-Fu Client
By: MrGreen

Usage:./SQLfu.rb [OPTIONS]

EX: ./SQLfu.rb -H site.com -U root -P Sup3rs3ecr3t -D FunHouseDB
EX: ./SQLfu.rb --host 192.168.2.13 --username root --password sup3rs3cr3t

Options: 
    -H, --host <HOST>                
	Target MySQL Host to Connect to
    -U, --username <USER>            
	MySQL Username to Connect as
    -P, --password <PASS>            
	MySQL Password to use for Connectiong
    -D, --database <DB_NAME>         
	MySQL Database to Connect to (Optional Argument)
    -h, --help                       
	Help Menu

Once Connected to the Database with valid credentials you will be greeted with some overview information and a menu with a list of options to choose from. Most of the options should be fairly self explanatory or additional directions are given when option selected. Here is a snapshot of what you would see post connection:

MySQL-Fu Client
By: MrGreen

w00t - Connected to MySQL Server!
Hostname: localhost.localdomain
Loged in as: root@192.168.2.2
Using Pass: sup3rs3cr3t
MySQL Version: 5.0.95
Data Dir: /var/lib/mysql/
Compiled on *nix: redhat-linux-gnu

Please enter the number for the option you want to run: 
0)   Get Me Out of Here!
1)   SHOW Available Database(s)
2)   SHOW Tables for Known Database
3)   SHOW Tables for All Databases
4)   SHOW Columns for Known Table & Database
5)   CREATE DB
6)   DROP DB
7)   DROP Table
8)   SHOW MySQL User Privileges
9)   SHOW MySQL Users, Passwords & Special Privileges
10a) CREATE New User w/Pass & GRANT Full Privileges
10b) INSERT New User & Pass with full privileges to mysql.user
10c) DELETE MySQL DB User
11)  UPDATE Column Data of Known Database + Table
12a) READ File using LOAD_FILE()
12b) READ File using LOAD DATA INFILE + TEMP TABLE
13)  WRITE REMOTE Shell/File using INTO OUTFILE()
14)  WRITE LOCAL File 2 Remote Server via LOAD DATA LOCAL INFILE + TEMP TABLE + INTO OUTFILE
15)  Pentestmonkey's PHP Reverse Shell via LOAD DATA LOCAL INFILE + TEMP TABLE + INTO OUTFILE
16)  DROP to SQL Shell for Custom SQL Queries
17)  DROP to LOCAL OS Shell for running quick LOCAL commands
18)  DUMP Table
19)  DUMP Database
20)  DUMP All
21)  KINGCOPE - CVE-2012-5613: Linux MySQL Privilege Escalation

DEMO VIDEO: http://youtu.be/Q3-dh73VG9I